Device and method for adaptive anti-skid control

Patent metadata

Field	Value
Publication number	US-10464538-B2
Application number	US-201615765901-A
Country	US
Kind code	B2
Filing date	Sep 27, 2016
Priority date	Oct 5, 2015
Publication date	Nov 5, 2019
Grant date	Nov 5, 2019

Abstract

A device and a method for adaptive activation of a brake system of a rail vehicle are provided, wherein the brake system is controlled according to a predetermined first and second slip parameter range, wherein the first slip parameter range is a macro slip range with a higher permissible slip range, and the second slip parameter range is a micro slip range with a lower permissible slip range, and wherein a maximally available brake force in the micro slip range and an average brake force of the brake system achieved in the current slip range are determined.

First claim

The invention claimed is:

1. A device for adaptively actuating a brake system of a rail vehicle by an anti-skid control function which prevents locking of a wheel of the rail vehicle under unfavorable adhesion conditions in the wheel-rail contact in that the anti-skid control function controls the brake system in accordance with a predetermined first and second slip parameter range, wherein the first slip parameter range is a macroslip range with relatively high permissible slip range, and the second slip parameter range is a microslip range with a relatively low permissible slip range, wherein the device comprises:
a processor configured to:
determine a maximum available braking force in the microslip range;
determine an average braking force, achieved in the current slip range, of the brake system;
compare the determined average braking force in the macroslip range with the maximum available braking force in the microslip range; and
set the macroslip range or the microslip range;
wherein, in response to a comparison result indicating an insufficient slipping effect in the macroslip range, the device is configured to bring about a transition from the macroslip range into the microslip range, or
wherein, in response to a comparison result indicating a sufficient slipping effect in the macroslip range, the device is configured to bring about a transition from the microslip range into the macroslip range.

2. The device of claim 1 , wherein the device is configured to bring about the comparison by the comparison means in response to achieving a predetermined friction travel.

3. The device of claim 2 , wherein the device is configured to determine the friction travel as a product of a time and a differential speed between the wheel and the rail vehicle.

4. The device of claim 1 , wherein the device is configured to leave, during a transition into the microslip range, at least one axle of the rail vehicle in the macroslip range as a test axle for a test phase.

5. The device of claim 4 , wherein the device is configured to end the test phase of the test axle when a predetermined introduced friction travel or a maximum test time is reached.

6. The device of claim 4 , wherein the device is configured to actuate the slip range-setting means to end the macroslip range of the test axle in response to an average braking force at the test axle being lower than a maximum braking force which is available in the microslip range and is evaluated with a factor.

7. The device of claim 1 , wherein the device is further configured to compare an average braking force of axles operated in the macroslip range with an average braking force of axles operated in the microslip range, and wherein the device operates all the axles of the brake system in the macroslip range in response to the average braking force of the axles which are operated in the macroslip range exceeding the average braking force of the axles which are operated in the microslip range, or to operate all the axles of the brake system in the microslip range in response to the average braking force of the axles operated in the microslip range exceeding the average braking force of the axles operated in the macroslip range.

8. The device of claim 7 , wherein the device is configured in such a way that the average braking force of the axles is determined by summing the average braking forces of the respective axles.

9. The device of claim 1 , wherein the maximum force-determining means are configured to determine the maximum braking force available in the microslip range at complete transition of the wheel-rail contact into a skidding phase by correlation with the force necessary for this purpose.

10. A method for adaptively actuating a brake system of a rail vehicle in such a way that locking of a wheel of the rail vehicle under unfavorable adhesion conditions in the wheel-rail contact is prevented, wherein the brake system is controlled in accordance with a predetermined first and second slip parameter range, wherein the first slip parameter range is a macroslip range with a relatively high permissible slip range, and the second slip parameter range is a microslip range with a relatively low permissible slip range, wherein the method comprising:
determining a maximum available braking force in the microslip range;
determining an average braking force, achieved in the current slip range, of the brake system;
comparing the determined average braking force in the macroslip range with the maximal available braking force in the microslip range; and
bringing about a transition from the macroslip range into the microslip range in response to a comparison result of the comparison step indicating an insufficient slipping effect in the macroslip range, or bringing about a transition from the microslip range into the macroslip range in response to a comparison result of the comparison step indicating a sufficient slipping effect in the macroslip range.

11. A non-transitory computer program product having code means for carrying out the operations as claimed in patent claim 10 when the program is executed on a computer device.

Assignees

• Knorr Bremse Systeme
• Knorr Bremse System Fur Schienenfahrzeuge Gmbh

Inventors

• Rasel Thomas
• Mayer Reinhold

Classifications

• B60T8/1705 Primary

  for rail vehicles · CPC title

• B60T8/17616

  Microprocessor-based systems · CPC title

• B60Y2200/30

  Railway vehicles · CPC title

• B60Y2400/81

  Braking systems · CPC title